THOUSAND OAKS >> On Christmas Eve, Paul McRoberts and Aaron Green made their NFL debuts, suiting up eight months after they signed with the Rams. Their days with the team however, could be numbered.

The two are among the seven undrafted rookies on the Rams’ 53-man roster, a list that also includes offensive tackle Pace Murphy, linebackers Cory Littleton and Nic Grigsby, defensive end Morgan Fox and cornerback Mike Jordan. The team will end the regular season Sunday at the Coliseum against the Cardinals (1:25 p.m., FOX). It could be the last chance for these first-year players to make a case for their long-term futures.

The Rams fired Jeff Fisher earlier this month. That means these rookies, who already entered the league as underdogs, will have to impress a whole new coaching staff, one that will likely pore over this season’s film to decide which players are worth keeping.

Does that add any extra pressure this weekend?

“Nah, not necessarily,” said Green, who ran for 1,272 yards in his final season at TCU, but has only taken four snaps for the Rams, all on special teams. “I know how good I am. I trust my abilities. Regardless of who comes in, I’m sure I’ll be fine.”

“It’s uncertainty, but you’ve just got to go with the flow of life,” McRoberts said. “It’s out of your control, at the end of the day.”

Confidence can’t hurt, though it won’t change daunting odds. When the Rams changed coaches five years ago, they ended the 2011 season with four undrafted rookies on their active roster. Fullback Ben Guidugli never dressed for a game, while offensive lineman Kevin Hughes and cornerback Chris Smith each played in three. None of them lasted past the following August or made another NFL appearance.

There is reason for hope. Fisher, who replaced Steve Spagnuolo, did retain longsnapper Jake McQuaide. Center Tim Barnes and running back Chase Reynolds also stuck around after spending the entire 2010 campaign on the practice squad. All three have become mainstays in the locker room, though Reynolds is playing out a one-year contract.

And considering that many current rookies are only getting playing time because of injuries, they have little room for error. Green and McRoberts were promoted from the practice squad a week ago after the Rams placed second-year receiver Bradley Marquez on injured reserve. Fox was promoted after the team ruled out starting defensive end Robert Quinn for the rest of the season.

But no one caught a bigger break than Jordan, who joined the active 53 shortly after fellow cornerback Troy Hill’s DUI arrest in November. With Hill waived and demoted to the practice squad for several weeks, Jordan started two games for a secondary that was also missing starter E.J. Gaines.

While he didn’t criticize Hill by name, Jordan did mention his ability to “stay focused, stay out of trouble” as one of the reasons behind his own success.

“A lot of people, including me, are new to this L.A. lifestyle, you know what I mean?” Jordan said. “So just not being one of those guys who have to go out every single night. Things like that. A lot of people don’t know how to handle themselves and they get in trouble with the lifestyle.”

Injury report

The Rams (4-11) did not practice on Thursday, but listed three starters as non-participants on their estimated injury report: Receiver Kenny Britt (shoulder), defensive back Lamarcus Joyner (ankle) and right tackle Rob Havenstein (ankle). McRoberts could get more playing time as a reserve if Britt sits out the season finale and Murphy could potentially replace Havenstein in the starting lineup.

Jack Wang covers the Chargers, the latest NFL team to relocate to Los Angeles. He previously covered the Rams, and also spent four years on the UCLA beat, a strange period in which the Bruins' football program often outpaced their basketball team. He is a proud graduate of UC Berkeley, where he spent most of his time in The Daily Californian offices in Eshleman Hall — a building that did not become earthquake-safe until after his time on campus.